netdev - Re: [PATCH net] net: bridge: mcast: don't delete permanent entries when fast leave is enabled

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Message-Id: <20190730.101811.1836331521043535108.davem@davemloft.net>
Date:   Tue, 30 Jul 2019 10:18:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     nikolay@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net] net: bridge: mcast: don't delete permanent entries
 when fast leave is enabled

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Date: Tue, 30 Jul 2019 14:21:00 +0300

> diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
> index 3d8deac2353d..f8cac3702712 100644
> --- a/net/bridge/br_multicast.c
> +++ b/net/bridge/br_multicast.c
> @@ -1388,6 +1388,9 @@ br_multicast_leave_group(struct net_bridge *br,
>  			if (!br_port_group_equal(p, port, src))
>  				continue;
>  
> +			if (p->flags & MDB_PG_FLAGS_PERMANENT)
> +				break;
> +

Like David, I also don't understand why this can be a break.  Is it because
permanent entries are always the last on the list?  Why will there be no
other entries that might need to be processed on the list?